Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9edc9152b78b51…

MALICIOUS

PDF

77.4 KB Created: 2021-05-19 21:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c92e79ea0290fbf0ae05719f0fb011c3 SHA-1: 945d6286633f6adc0be676cf84bcbe44a49bd2c5 SHA-256: 2c9edc9152b78b51dabb03bae45b652a8d5ec9f745a74b8e375be6fbdee5ecdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://maypoin.ru/strik?utm_term=solving+two+step+equations+word+problems+worksheet+answer+key', is presented as a worksheet answer key, a common lure for phishing or malware delivery. ClamAV and ML heuristics confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/strik?utm_term=solving+two+step+equations+word+problems+worksheet+answer+key PDF link annotation
    • https://sadaxolofomet.weebly.com/uploads/1/3/1/4/131453623/abc1c8b7709991b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_60476bcb1959c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_605795af85109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_5fd2cb52901e3.pdfIn PDF document text
    • https://wavafebezed.weebly.com/uploads/1/3/4/5/134527209/3185b9c.pdfIn PDF document text
    • https://zatalabevixet.weebly.com/uploads/1/3/2/7/132741241/gozoseboz.pdfIn PDF document text
    • https://betutemibo.weebly.com/uploads/1/3/1/4/131453998/2edd6c7ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_60218ae1e5834.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/davisafasawiraz.pdfIn PDF document text
    • https://lafirepekawaxa.weebly.com/uploads/1/3/4/7/134760561/3e16c79.pdfIn PDF document text
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/2342967.pdfIn PDF document text
    • https://furujito.weebly.com/uploads/1/3/1/3/131398045/fawisuvut.pdfIn PDF document text
    • https://kuratoso.weebly.com/uploads/1/3/4/3/134329811/pifisu.pdfIn PDF document text
    • https://digavonuvuveg.weebly.com/uploads/1/3/4/8/134851043/zimojodorupup.pdfIn PDF document text
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/mutiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_6056f8f0289ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/nagewuvatijoxome.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/wemokewikifawu.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/sennheiser_ew_100_g4-me2-ii.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/buttered_popcorn_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/durga_amritwani_ringtone_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/zulofobovusekuz.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/rca_rt2781hb_receiver.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 6060 bytes
SHA-256: afabf08b4c1b1c9d8e4df5f423ae5f0e48c6dc566cc540bc572abcde6a83bf2c
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 10272 bytes
SHA-256: 37753ef3b60c795e19f15c7576f4afb5a0498efca9d89a91114d6c03a7069976

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